/*! \page Slat_wfDoc Slater determinant

Keyword: SLATER 

\section description Description

A Slater determinant or linear combination of several determinants.
Also can use the same molecular orbitals to create several separate
combinations of determinants.

\section options Options

\subsection reqopt Required 

<table>
<tr> <td> <b>Option</b> <td> <b>Type</b> <td> <b>Description</b>
<tr> <td> DETWT  <td> Section <td> list of the weights of the determinants 
<tr> <td> STATES  <td> Section <td> List of the occupations of the molecular orbitals, first
spin up, then spin down.  For example, a RHF determinant might be <br>
1 2 3 <br>
1 2 3 <br>
and a UHF might be <br>
1 2 3 <br>
4 5 6 <br>
If there are more than one determinant, simply continue listing up and 
down occupations.<br>  Also, list several STATES functions, and they
will be added as separate guiding functions. 
<tr> <td> ORBITALS/<br>CORBITALS <td> Section
<td> Input for a \ref MO_matrixDoc. When ORBITALS section is used,
real-valued wave function is constructed (in the DMC method,
fixed-node algorithm will be applied). When CORBITALS section is used, the
Slater determinant is complex-valued (in the DMC method, fixed-phase
algorithm will be applied).
</table>

\subsection optopt Optional

<table>
<tr> <td> <b>Option</b> <td> <b>Type</b> <td> <b> Default </b> 
     <td> <b>Description</b>
<tr> <td> NSPIN  <td> Section <td> same as in SYSTEM <td>  Override the global parameter.
<tr> <td> OPTIMIZE_DET <td> Flag <td> off <td> Optimize the determinantal coefficients.  For a single 
determinant, this does nothing.
<tr> <td> CSF <td> Section <td> Do nothing <td> This replaces DETWT, and lists configuration state functions to reduce the number of variational parameters.  The format is CSF { overallweight  weight_det1 weight_det2 ... }.  Only the overall weight is optimized.  List a separate CSF section for each CSF.
<tr> <td> CLARK_UPDATES <td> Flag <td> off <td> Force Bryan Clark's updates (J. Chem. Phys 135, 244105 (2011)) of the determinant inverses and values.  By default, this is enabled when there is more than one determinant and more than 10 electrons, in which case it is expected to save memory and computer time.
<tr> <td> SHERMAN_MORRISON <td> Flag <td> off <td>  Force the Sherman-Morrison updates of the determinant inverses and values

</table>


*/
